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Re: commit 3661261f breaks arm64
From: |
Leif Lindholm |
Subject: |
Re: commit 3661261f breaks arm64 |
Date: |
Wed, 28 Jan 2015 19:36:24 +0000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Jan 28, 2015 at 09:58:56PM +0300, Andrei Borzenkov wrote:
> В Wed, 28 Jan 2015 18:33:59 +0000
> Leif Lindholm <address@hidden> пишет:
>
> > commit 3661261fe17a8fe19681073889b5b36ec1ee823d,
> > "Always add -msoft-float to avoid compiler generating float
> > arithmetics." breaks the arm64 build.
> >
> > -msoft-float is not a valid command line option for aarch64 (as far as
> > I can see, it is technically a target-specific option which just
> > happens to exist for most targets - including arm).
> >
> > This setting will need to be conditionalised somehow.
> > An option that works for arm64 is -march=armv8-a+nofp+nosimd.
> >
> > Would something like this be an acceptable workaround?:
> >
> > diff --git a/configure.ac b/configure.ac
> > index a3bca06..c99e1ea 100644
> > --- a/configure.ac
> > +++ b/configure.ac
> > @@ -678,7 +678,11 @@ fi
> > # that floats are a good fit to run instead of what's written in the
> > # code.
> > # Given that floating point unit is disabled (if present to begin
> > # with)
> > # when GRUB is running which may result in various hard crashes.
> > -TARGET_CFLAGS="$TARGET_CFLAGS -msoft-float"
> > +if ( test "x$target_cpu" = xarm64 ); then
>
> Why subshell?
Brainless cargo culting to look similar to the preceding $target_cpu
checker, which actually does something relevant with its subshell.
If I drop that, is that an acceptable fix?
> > + TARGET_CFLAGS="$TARGET_CFLAGS -march=armv8-a+nofp+nosimd"
> > +else
> > + TARGET_CFLAGS="$TARGET_CFLAGS -msoft-float"
> > +fi
> >
> > # By default, GCC 4.4 generates .eh_frame sections containing unwind
> > # information in some cases where it previously did not. GRUB doesn't
> > # need
> >
> > /
> > Leif
> >
> > _______________________________________________
> > Grub-devel mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/grub-devel
>